Alert archive / Pennsylvania / Areal Flood Advisories in 2020

Areal Flood Advisory 124, NWS Philadelphia/Mount Holly

August 7, 2020Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 7, 2020, 9:22 AM EDT for Bucks County, Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Aug 7, 2020, 9:22 AM EDT (13:22 UTC)
Expired: Aug 7, 2020, 12:17 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Bucks County, PA

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 1.4 hours before the alert went out and 198 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1352 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood advisory went out at Aug 7, 6:15 AM EDT, 3 hours 7 minutes earlier.

Area forecast discussion, Aug 7, 6:15 AM EDT, 3 hours 7 minutes before

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Hazardous weather outlook, Aug 7, 2:14 AM EDT, 7 hours 8 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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In the hours before

Local storm report, Aug 7, 3:28 AM EDT, 5 hours 54 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Aug 7, 3:34 AM EDT, 5 hours 48 minutes before

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<html lang="en">
<head>
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  <title>Service Notice</title>
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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
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Local storm report, Aug 7, 3:37 AM EDT, 5 hours 45 minutes before

<!doctype html>
<html lang="en">
<head>
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  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 7, 8:50 AM EDT, 32 minutes before

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<html lang="en">
<head>
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  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 5:15 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Aug 7, 5:25 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	3 hr
Aug 7, 5:43 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester	4 hr
Aug 7, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	48 min
Aug 7, 6:00 PM EDT	Tornado Warning	PHI	Gloucester, Salem	30 min
Aug 7, 6:08 PM EDT	Areal Flood Advisory	PHI	Cumberland, Gloucester, Salem	3 hr
Aug 7, 6:16 PM EDT	Areal Flood Advisory	PHI	Mercer	2 hr
Aug 7, 6:24 PM EDT	Special Marine Warning	PHI		66 min
Aug 7, 6:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer	27 min
Aug 7, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	49 min
Aug 7, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	48 min
Aug 7, 7:24 PM EDT	Special Marine Warning	PHI		66 min
Aug 7, 7:25 PM EDT	Flash Flood Warning	PHI	Atlantic, Cape May, Cumberland, Gloucester	4 hr
Aug 7, 7:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	62 min
Aug 7, 6:49 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 7, 10:34 AM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh	56 min
Aug 7, 11:28 AM EDT	Special Weather Statement	PHI	Carbon, Lehigh	47 min
Aug 7, 2:34 PM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 7, 3:46 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Northampton	4 hr
Aug 7, 4:10 PM EDT	Flash Flood Warning	PHI	Berks	2 hr
Aug 7, 4:20 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	4 hr
Aug 7, 4:32 PM EDT	Flash Flood Warning	PHI	Chester	3 hr
Aug 7, 4:47 PM EDT	Special Weather Statement	PHI	Chester	28 min
Aug 7, 5:00 PM EDT	Severe Thunderstorm Warning	PHI	Chester	60 min
Aug 7, 5:03 PM EDT	Flash Flood Warning	PHI	Chester, Delaware	5 hr
Aug 7, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	52 min
Aug 7, 5:49 PM EDT	Tornado Warning	PHI	Chester, Delaware	26 min
Aug 7, 7:10 PM EDT	River Flood Warning	PHI	Delaware	7 hr
Aug 7, 7:17 PM EDT	Areal Flood Warning	PHI	Bucks, Montgomery	3 hr
Aug 7, 6:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	63 min
Aug 7, 6:43 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Aug 7, 7:04 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	41 min
Aug 7, 7:21 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	5 hr
Aug 7, 7:28 PM EDT	River Flood Warning	PHI	New Castle	2 hr
Aug 7, 7:36 PM EDT	Special Weather Statement	PHI	Kent	39 min

Nearby

Areal Flood Advisories in Pennsylvania, 2020 Every areal flood advisory in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.